/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.log4j.net;

import java.net.Socket;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.BufferedInputStream;

import org.apache.log4j.*;
import org.apache.log4j.spi.*;

// Contributors:  Moses Hohman <mmhohman@rainbow.uchicago.edu>

/**
 * Read {@link LoggingEvent} objects sent from a remote client using Sockets
 * (TCP). These logging events are logged according to local policy, as if they
 * were generated locally.
 * 
 * <p>
 * For example, the socket node might decide to log events to a local file and
 * also resent them to a second socket node.
 * 
 * @author Ceki G&uuml;lc&uuml;
 * @since 0.8.4
 */
public class SocketNode implements Runnable {

	Socket socket;
	LoggerRepository hierarchy;
	ObjectInputStream ois;

	static Logger logger = Logger.getLogger(SocketNode.class);

	public SocketNode(Socket socket, LoggerRepository hierarchy) {
		this.socket = socket;
		this.hierarchy = hierarchy;
		try {
			ois = new ObjectInputStream(new BufferedInputStream(socket
					.getInputStream()));
		} catch (Exception e) {
			logger.error("Could not open ObjectInputStream to " + socket, e);
		}
	}

	// public
	// void finalize() {
	// System.err.println("-------------------------Finalize called");
	// System.err.flush();
	// }

	public void run() {
		LoggingEvent event;
		Logger remoteLogger;

		try {
			if (ois != null) {
				while (true) {
					// read an event from the wire
					event = (LoggingEvent) ois.readObject();
					// get a logger from the hierarchy. The name of the logger
					// is taken to be the name contained in the event.
					remoteLogger = hierarchy.getLogger(event.getLoggerName());
					// event.logger = remoteLogger;
					// apply the logger-level filter
					if (event.getLevel().isGreaterOrEqual(
							remoteLogger.getEffectiveLevel())) {
						// finally log the event as if was generated locally
						remoteLogger.callAppenders(event);
					}
				}
			}
		} catch (java.io.EOFException e) {
			logger.info("Caught java.io.EOFException closing conneciton.");
		} catch (java.net.SocketException e) {
			logger.info("Caught java.net.SocketException closing conneciton.");
		} catch (IOException e) {
			logger.info("Caught java.io.IOException: " + e);
			logger.info("Closing connection.");
		} catch (Exception e) {
			logger.error("Unexpected exception. Closing conneciton.", e);
		} finally {
			if (ois != null) {
				try {
					ois.close();
				} catch (Exception e) {
					logger.info("Could not close connection.", e);
				}
			}
			if (socket != null) {
				try {
					socket.close();
				} catch (IOException ex) {
				}
			}
		}
	}
}
